/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

    Info<< "Reading field U\n" << endl;
    volVectorField U
    (
        IOobject
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::NO_WRITE
        ),
        mesh
    );

    Info<< "Calculating wall distance field" << endl;
    volScalarField y(wallDist(mesh).y());

    // Set the mean boundary-layer thickness
    dimensionedScalar ybl("ybl", dimLength, 0);

    if (args.optionFound("ybl"))
    {
        // If the boundary-layer thickness is provided use it
        ybl.value() = args.optionRead<scalar>("ybl");
    }
    else if (args.optionFound("Cbl"))
    {
        // Calculate boundary layer thickness as Cbl * mean distance to wall
        ybl.value() = gAverage(y) * args.optionRead<scalar>("Cbl");
    }

    Info<< "\nCreating boundary-layer for U of thickness "
        << ybl.value() << " m" << nl << endl;


// ************************************************************************* //
